Chiral Effect at Protein/Graphene Interface: A Bioinspired Perspective To Understand Amyloid Formation

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• 作者：Guangyan Qing ; Shilong Zhao ; Y眉ting Xiong ; Ziyu Lv ; Fenglei Jiang ; Yi Liu ; Hui Chen ; Mingxi Zhang ; Taolei Sun
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：July 30, 2014
• 年：2014
• 卷：136
• 期：30
• 页码：10736-10742
• 全文大小：521K
• ISSN：1520-5126

文摘

Protein misfolding to form amyloid aggregates is the main cause of neurodegenerative diseases. While it has been widely acknowledged that amyloid formation in vivo is highly associated with molecular surfaces, particularly biological membranes, how their intrinsic features, for example, chirality, influence this process still remains unclear. Here we use cysteine enantiomer modified graphene oxide (GO) as a model to show that surface chirality strongly influences this process. We report that R-cysteine modification suppresses the adsorption, nucleation, and fiber elongation processes of A尾(1鈥?0) and thus largely inhibits amyloid fibril formation on the surface, while S-modification promotes these processes. And surface chirality also greatly influences the conformational transition of A尾(1鈥?0) from 伪-helix to 尾-sheet. More interestingly, we find that this effect is highly related to the distance between chiral moieties and GO surface, and inserting a spacer group of about 1鈥? nm between them prevents the adsorption of A尾(1鈥?0) oligomers, which eliminates the chiral effect. Detailed study stresses the crucial roles of GO surface. It brings novel insights for better understanding the amyloidosis process on surface from a biomimetic perspective.